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ViewAttendees 16

P-IE

10-Minute Paper

10-min: P-IE, Biocontrol

Spread and phenology of the introduced larval parasitoids Spathius galinae and Tetrastichus planipennisi: Implications for biocontrol of Agrilus planipennis

On-Demand
On-Demand
Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), or emerald ash borer (EAB) is an invasive wood-boring pest of ash trees (Fraxinus spp.) in the US. It is responsible for catastrophic decline of ash in urban and forested ecosystems, resulting in millions of dollars in injury and losses. Biological control is thought to be one of the most promising management options available to reduce EAB spread and impact. To this end, from 2015 to 2017 two larval parasitoids of EAB from its native range, Spathius galinae Belokobylskij & Strazenac (Hymenoptera: Braconidae) and Tetrastichus planipennisi Yang (Hymenoptera: Eulophidae), were released in wooded areas in New York and Connecticut. The purpose of this study was to measure the long-term spread and phenology of the released parasitoids. From May to September 2020, sentinel ash logs containing EAB larvae were deployed in naturally occurring EAB-infested trees at each release site. Additional logs were deployed in 2km intervals up to 14km away from the release site. Logs were replaced every two weeks and the parasitization rate was recorded. Each month, three trees from each release area were cut and debarked to record EAB infestation levels, natural parasitization rates, and EAB and parasitoid phenology. Results are discussed in the context of ongoing EAB biological control efforts.